49 lines
1.5 KiB
Objective-C
49 lines
1.5 KiB
Objective-C
/**
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Copyright 2018 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#import "FBLPromise+Await.h"
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#import "FBLPromisePrivate.h"
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id __nullable FBLPromiseAwait(FBLPromise *promise, NSError **outError) {
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assert(promise);
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static dispatch_once_t onceToken;
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static dispatch_queue_t queue;
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dispatch_once(&onceToken, ^{
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queue = dispatch_queue_create("com.google.FBLPromises.Await", DISPATCH_QUEUE_CONCURRENT);
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});
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dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
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id __block resolution;
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NSError __block *blockError;
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[promise chainOnQueue:queue
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chainedFulfill:^id(id value) {
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resolution = value;
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dispatch_semaphore_signal(semaphore);
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return value;
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}
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chainedReject:^id(NSError *error) {
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blockError = error;
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dispatch_semaphore_signal(semaphore);
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return error;
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}];
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dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
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if (outError) {
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*outError = blockError;
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}
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return resolution;
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}
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